700-221Section 724 — Elastomeric Bearings
724.1Description
1 Furnish and install elastomeric bearings, either plain (consisting of elastomer only) or laminated (consisting of alternating individual layers of elastomer and internal steel laminates) .
724.2Materials
1 Provide elastomer materials consisting of low -temperature Grade 2 Polychloroprene (Neoprene) as required by AASHTO M 251. Ensure that all bearings comply with the requirements of AASHTO M 251 as specified by the Plans. 2 Obtain elastomeric bearings that are fabricated by a manufacturer on Qualified Products List 24 .
724.3Construction
1 Submit Shop Plans for bridge bearing assemblies according to Section 725 .
724.3.1 Fabrication 1 Fabricate t he bearing pad in conformance with AASHTO M 251 and in conformance with the details shown in the Plans. 2 Fill pin grooves in laminated bearings with a vulcanized neoprene or silicone material capable of bonding and maintaining integrity with the pad.
724.3.2 Reporting 1 Ensure that the manufacturer performs all testing as required by AASHTO M 251. 2 Provide a manufacturer’s material certification with each shipped lot of bearings, certifying that the specific lot of bearings meets SCDOT and AASHTO M 251 requirements. Ensure that the certification packet includes the specific lot number and the manufacturer’s certified test results for the lot. For laminated elastomeric bearings, include mill test reports for all steel used in the bearings.
724.3.3 Installation 1 Plane bearing surfaces under the elastomer to within 0.062 in. and horizontal to within 0.01 radians according to the Contract . Ensure that the elastomeric bearings bear directly on the concrete surface.